# git rev-parse -q --verify 574823bfab82d9d8fa47f422778043fbb4b4f50e^{commit} 574823bfab82d9d8fa47f422778043fbb4b4f50e already have revision, skipping fetch # git checkout -q -f -B kisskb 574823bfab82d9d8fa47f422778043fbb4b4f50e # git clean -qxdf # < git log -1 # commit 574823bfab82d9d8fa47f422778043fbb4b4f50e # Author: Linus Torvalds # Date: Sat Jan 5 17:50:59 2019 -0800 # # Change mincore() to count "mapped" pages rather than "cached" pages # # The semantics of what "in core" means for the mincore() system call are # somewhat unclear, but Linux has always (since 2.3.52, which is when # mincore() was initially done) treated it as "page is available in page # cache" rather than "page is mapped in the mapping". # # The problem with that traditional semantic is that it exposes a lot of # system cache state that it really probably shouldn't, and that users # shouldn't really even care about. # # So let's try to avoid that information leak by simply changing the # semantics to be that mincore() counts actual mapped pages, not pages # that might be cheaply mapped if they were faulted (note the "might be" # part of the old semantics: being in the cache doesn't actually guarantee # that you can access them without IO anyway, since things like network # filesystems may have to revalidate the cache before use). # # In many ways the old semantics were somewhat insane even aside from the # information leak issue. From the very beginning (and that beginning is # a long time ago: 2.3.52 was released in March 2000, I think), the code # had a comment saying # # Later we can get more picky about what "in core" means precisely. # # and this is that "later". Admittedly it is much later than is really # comfortable. # # NOTE! This is a real semantic change, and it is for example known to # change the output of "fincore", since that program literally does a # mmmap without populating it, and then doing "mincore()" on that mapping # that doesn't actually have any pages in it. # # I'm hoping that nobody actually has any workflow that cares, and the # info leak is real. # # We may have to do something different if it turns out that people have # valid reasons to want the old semantics, and if we can limit the # information leak sanely. # # Cc: Kevin Easton # Cc: Jiri Kosina # Cc: Masatake YAMATO # Cc: Andrew Morton # Cc: Greg KH # Cc: Peter Zijlstra # Cc: Michal Hocko # Signed-off-by: Linus Torvalds # < /opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-gcc --version # < /opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux-ld --version # < git log --format=%s --max-count=1 574823bfab82d9d8fa47f422778043fbb4b4f50e # < make -s -j 8 ARCH=sparc O=/kisskb/build/linus_sparc-allmodconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux- allmodconfig # Added to kconfig CONFIG_64BIT=n # Added to kconfig CONFIG_BUILD_DOCSRC=n # Added to kconfig CONFIG_HAVE_FTRACE_MCOUNT_RECORD=n # Added to kconfig CONFIG_SAMPLES=n # Added to kconfig CONFIG_MODULE_SIG=n # yes \n | make -s -j 8 ARCH=sparc O=/kisskb/build/linus_sparc-allmodconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux- oldconfig yes: standard output: Broken pipe # make -s -j 8 ARCH=sparc O=/kisskb/build/linus_sparc-allmodconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux- :1336:2: warning: #warning syscall rseq not implemented [-Wcpp] /kisskb/src/net/core/sysctl_net_core.c:285:1: warning: 'proc_dointvec_minmax_bpf_restricted' defined but not used [-Wunused-function] proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, ^ /kisskb/src/drivers/char/tpm/tpm2-cmd.c: In function 'tpm2_unseal_trusted': /kisskb/src/drivers/char/tpm/tpm2-cmd.c:668:2: warning: 'blob_handle' may be used uninitialized in this function [-Wmaybe-uninitialized] tpm2_flush_context_cmd(chip, blob_handle, TPM_TRANSMIT_UNLOCKED); ^ In file included from /kisskb/src/arch/sparc/include/asm/cmpxchg.h:7:0, from /kisskb/src/arch/sparc/include/asm/atomic_32.h:17, from /kisskb/src/arch/sparc/include/asm/atomic.h:7, from /kisskb/src/include/linux/atomic.h:7, from /kisskb/src/include/asm-generic/bitops/lock.h:5, from /kisskb/src/arch/sparc/include/asm/bitops_32.h:102, from /kisskb/src/arch/sparc/include/asm/bitops.h:7, from /kisskb/src/include/linux/bitops.h:19, from /kisskb/src/include/linux/kernel.h:11, from /kisskb/src/include/linux/list.h:9, from /kisskb/src/include/linux/wait.h:7, from /kisskb/src/include/linux/wait_bit.h:8, from /kisskb/src/include/linux/fs.h:6, from /kisskb/src/fs/ocfs2/file.c:27: /kisskb/src/fs/ocfs2/file.c: In function 'ocfs2_file_write_iter': /kisskb/src/arch/sparc/include/asm/cmpxchg_32.h:28:22: warning: value computed is not used [-Wunused-value] #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) ^ /kisskb/src/fs/ocfs2/file.c:2386:3: note: in expansion of macro 'xchg' xchg(&iocb->ki_complete, saved_ki_complete); ^ /kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery': /kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized] if (ret == -EOPNOTSUPP) ^ /kisskb/src/drivers/input/joystick/analog.c:172:2: warning: #warning Precise timer not defined for this architecture. [-Wcpp] #warning Precise timer not defined for this architecture. ^ In file included from /kisskb/src/include/linux/printk.h:7:0, from /kisskb/src/include/linux/kernel.h:14, from /kisskb/src/include/linux/list.h:9, from /kisskb/src/include/linux/rculist.h:10, from /kisskb/src/include/linux/sched/signal.h:5, from /kisskb/src/drivers/net/usb/hso.c:55: /kisskb/src/drivers/net/usb/hso.c: In function 'hso_serial_set_termios': /kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%d' expects argument of type 'int', but argument 4 has type 'tcflag_t {aka long unsigned int}' [-Wformat=] #define KERN_SOH "\001" /* ASCII Start Of Header */ ^ /kisskb/src/include/linux/kern_levels.h:14:19: note: in expansion of macro 'KERN_SOH' #define KERN_INFO KERN_SOH "6" /* informational */ ^ /kisskb/src/include/linux/printk.h:310:9: note: in expansion of macro 'KERN_INFO' printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) ^ /kisskb/src/drivers/net/usb/hso.c:115:3: note: in expansion of macro 'pr_info' pr_info("[%d:%s] " fmt, \ ^ /kisskb/src/drivers/net/usb/hso.c:1406:3: note: in expansion of macro 'hso_dbg' hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n", ^ /kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%d' expects argument of type 'int', but argument 5 has type 'tcflag_t {aka long unsigned int}' [-Wformat=] #define KERN_SOH "\001" /* ASCII Start Of Header */ ^ /kisskb/src/include/linux/kern_levels.h:14:19: note: in expansion of macro 'KERN_SOH' #define KERN_INFO KERN_SOH "6" /* informational */ ^ /kisskb/src/include/linux/printk.h:310:9: note: in expansion of macro 'KERN_INFO' printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__) ^ /kisskb/src/drivers/net/usb/hso.c:115:3: note: in expansion of macro 'pr_info' pr_info("[%d:%s] " fmt, \ ^ /kisskb/src/drivers/net/usb/hso.c:1406:3: note: in expansion of macro 'hso_dbg' hso_dbg(0x16, "Termios called with: cflags new[%d] - old[%d]\n", ^ In file included from /kisskb/src/arch/sparc/include/asm/cmpxchg.h:7:0, from /kisskb/src/arch/sparc/include/asm/atomic_32.h:17, from /kisskb/src/arch/sparc/include/asm/atomic.h:7, from /kisskb/src/include/linux/atomic.h:7, from /kisskb/src/include/asm-generic/bitops/lock.h:5, from /kisskb/src/arch/sparc/include/asm/bitops_32.h:102, from /kisskb/src/arch/sparc/include/asm/bitops.h:7, from /kisskb/src/include/linux/bitops.h:19, from /kisskb/src/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:11: /kisskb/src/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c: In function 'ixgbevf_xdp_setup': /kisskb/src/arch/sparc/include/asm/cmpxchg_32.h:28:22: warning: value computed is not used [-Wunused-value] #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) ^ /kisskb/src/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c:4471:4: note: in expansion of macro 'xchg' xchg(&adapter->rx_ring[i]->xdp_prog, adapter->xdp_prog); ^ /kisskb/src/drivers/tty/serial/sunzilog.c:1132:13: warning: 'sunzilog_putchar' defined but not used [-Wunused-function] static void sunzilog_putchar(struct uart_port *port, int ch) ^ In file included from /kisskb/src/include/linux/rwsem.h:16:0, from /kisskb/src/include/linux/notifier.h:15, from /kisskb/src/include/linux/clk.h:17, from /kisskb/src/drivers/tty/serial/sh-sci.c:24: /kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_submit_rx': /kisskb/src/include/linux/spinlock.h:279:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] _raw_spin_unlock_irqrestore(lock, flags); \ ^ /kisskb/src/drivers/tty/serial/sh-sci.c:1338:16: note: 'flags' was declared here unsigned long flags; ^ /kisskb/src/drivers/scsi/myrs.c: In function 'myrs_log_event': /kisskb/src/drivers/scsi/myrs.c:821:24: warning: 'sshdr.sense_key' may be used uninitialized in this function [-Wmaybe-uninitialized] struct scsi_sense_hdr sshdr; ^ WARNING: EXPORT symbol "__lshrdi3" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "___rw_write_enter" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "__ashldi3" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "__ndelay" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "__udelay" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "__ashrdi3" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "___rw_read_try" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "__muldi3" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "__divdi3" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "bzero_1page" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "___rw_read_enter" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "___rw_read_exit" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "empty_zero_page" [vmlinux] version generation failed, symbol will not be versioned. WARNING: EXPORT symbol "__copy_1page" [vmlinux] version generation failed, symbol will not be versioned. arch/sparc/kernel/head_32.o: In function `current_pc': arch/sparc/kernel/head_32.o:(.head.text+0x5040): relocation truncated to fit: R_SPARC_WDISP22 against `.init.text' arch/sparc/kernel/head_32.o: In function `halt_notsup': arch/sparc/kernel/head_32.o:(.head.text+0x5100): relocation truncated to fit: R_SPARC_WDISP22 against `.init.text' arch/sparc/kernel/head_32.o: In function `leon_init': arch/sparc/kernel/head_32.o:(.init.text+0xa4): relocation truncated to fit: R_SPARC_WDISP22 against symbol `leon_smp_cpu_startup' defined in .text section in arch/sparc/kernel/trampoline_32.o arch/sparc/kernel/process_32.o:(.fixup+0x4): relocation truncated to fit: R_SPARC_WDISP22 against `.text' arch/sparc/kernel/process_32.o:(.fixup+0xc): relocation truncated to fit: R_SPARC_WDISP22 against `.text' arch/sparc/kernel/signal_32.o:(.fixup+0x4): relocation truncated to fit: R_SPARC_WDISP22 against `.text' arch/sparc/kernel/signal_32.o:(.fixup+0x10): relocation truncated to fit: R_SPARC_WDISP22 against `.text' arch/sparc/kernel/signal_32.o:(.fixup+0x1c): relocation truncated to fit: R_SPARC_WDISP22 against `.text' arch/sparc/kernel/signal_32.o:(.fixup+0x28): relocation truncated to fit: R_SPARC_WDISP22 against `.text' arch/sparc/kernel/signal_32.o:(.fixup+0x34): relocation truncated to fit: R_SPARC_WDISP22 against `.text' arch/sparc/kernel/signal_32.o:(.fixup+0x40): additional relocation overflows omitted from the output make[1]: *** [/kisskb/src/Makefile:1027: vmlinux] Error 1 make: *** [Makefile:152: sub-make] Error 2 Command 'make -s -j 8 ARCH=sparc O=/kisskb/build/linus_sparc-allmodconfig_sparc64 CROSS_COMPILE=/opt/cross/kisskb/br-sparc64-full-2016.08-613-ge98b4dd/bin/sparc64-linux- ' returned non-zero exit status 2 # rm -rf /kisskb/build/linus_sparc-allmodconfig_sparc64 # Build took: 0:14:10.188865