# git rev-parse -q --verify 3a7e02c040b130b5545e4b115aada7bacd80a2b6^{commit} 3a7e02c040b130b5545e4b115aada7bacd80a2b6 already have revision, skipping fetch # git checkout -q -f -B kisskb 3a7e02c040b130b5545e4b115aada7bacd80a2b6 # git clean -qxdf # < git log -1 # commit 3a7e02c040b130b5545e4b115aada7bacd80a2b6 # Author: Linus Torvalds # Date: Fri Jul 26 15:32:27 2024 -0700 # # minmax: avoid overly complicated constant expressions in VM code # # The minmax infrastructure is overkill for simple constants, and can # cause huge expansions because those simple constants are then used by # other things. # # For example, 'pageblock_order' is a core VM constant, but because it was # implemented using 'min_t()' and all the type-checking that involves, it # actually expanded to something like 2.5kB of preprocessor noise. # # And when that simple constant was then used inside other expansions: # # #define pageblock_nr_pages (1UL << pageblock_order) # #define pageblock_start_pfn(pfn) ALIGN_DOWN((pfn), pageblock_nr_pages) # # and we then use that inside a 'max()' macro: # # case ISOLATE_SUCCESS: # update_cached = false; # last_migrated_pfn = max(cc->zone->zone_start_pfn, # pageblock_start_pfn(cc->migrate_pfn - 1)); # # the end result was that one statement expanding to 253kB in size. # # There are probably other cases of this, but this one case certainly # stood out. # # I've added 'MIN_T()' and 'MAX_T()' macros for this kind of "core simple # constant with specific type" use. These macros skip the type checking, # and as such need to be very sparingly used only for obvious cases that # have active issues like this. # # Reported-by: Lorenzo Stoakes # Link: https://lore.kernel.org/all/36aa2cad-1db1-4abf-8dd2-fb20484aabc3@lucifer.local/ # Cc: David Laight # Signed-off-by: Linus Torvalds # < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/mips-linux/bin/mips-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/mips-linux/bin/mips-linux-ld --version # < git log --format=%s --max-count=1 3a7e02c040b130b5545e4b115aada7bacd80a2b6 # make -s -j 40 ARCH=mips O=/kisskb/build/linus_allmodconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/mips-linux/bin/mips-linux- allmodconfig # Added to kconfig CONFIG_BUILD_DOCSRC=n # Added to kconfig CONFIG_MODULE_SIG=n # Added to kconfig CONFIG_SAMPLES=n # Added to kconfig CONFIG_MIPS_CPS_NS16550_BASE=0x1b0003f8 # Added to kconfig CONFIG_MIPS_CPS_NS16550_SHIFT=0 # Added to kconfig CONFIG_GCC_PLUGINS=n # Added to kconfig # < make -s -j 40 ARCH=mips O=/kisskb/build/linus_allmodconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/mips-linux/bin/mips-linux- help # make -s -j 40 ARCH=mips O=/kisskb/build/linus_allmodconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/mips-linux/bin/mips-linux- olddefconfig .config:15204:warning: override: reassigning to symbol MIPS_CPS_NS16550_SHIFT # make -s -j 40 ARCH=mips O=/kisskb/build/linus_allmodconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/mips-linux/bin/mips-linux- /kisskb/src/arch/mips/boot/dts/img/boston.dts:128.17-178.5: Warning (interrupt_provider): /pci@14000000/pci2_root@0,0: '#interrupt-cells' found, but node is not an interrupt provider /kisskb/src/arch/mips/boot/dts/img/boston.dts:136.23-177.6: Warning (interrupt_provider): /pci@14000000/pci2_root@0,0/eg20t_bridge@1,0,0: '#interrupt-cells' found, but node is not an interrupt provider arch/mips/boot/dts/img/boston.dtb: Warning (interrupt_map): Failed prerequisite 'interrupt_provider' /kisskb/src/fs/btrfs/inode.c: In function 'btrfs_lookup_dentry': /kisskb/src/fs/btrfs/inode.c:5674:5: error: 'location.type' may be used uninitialized in this function [-Werror=maybe-uninitialized] if (location.type == BTRFS_INODE_ITEM_KEY) { ^ /kisskb/src/fs/btrfs/inode.c:5603:9: error: 'location.objectid' may be used uninitialized in this function [-Werror=maybe-uninitialized] return btrfs_iget_path(ino, root, NULL); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /kisskb/src/fs/btrfs/inode.c:5663:19: note: 'location.objectid' was declared here struct btrfs_key location; ^~~~~~~~ cc1: all warnings being treated as errors make[5]: *** [/kisskb/src/scripts/Makefile.build:244: fs/btrfs/inode.o] Error 1 make[4]: *** [/kisskb/src/scripts/Makefile.build:485: fs/btrfs] Error 2 make[4]: *** Waiting for unfinished jobs.... make[3]: *** [/kisskb/src/scripts/Makefile.build:485: fs] Error 2 make[3]: *** Waiting for unfinished jobs.... make[2]: *** [/kisskb/src/Makefile:1926: .] Error 2 make[1]: *** [/kisskb/src/Makefile:224: __sub-make] Error 2 make: *** [Makefile:224: __sub-make] Error 2 Command 'make -s -j 40 ARCH=mips O=/kisskb/build/linus_allmodconfig_mips-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/mips-linux/bin/mips-linux- ' returned non-zero exit status 2. # rm -rf /kisskb/build/linus_allmodconfig_mips-gcc8 # Build took: 0:10:36.117679