# git rev-parse -q --verify 69bf4b6b54fb7f52b7ea9ce28d4a360cd5ec956d^{commit}
69bf4b6b54fb7f52b7ea9ce28d4a360cd5ec956d
already have revision, skipping fetch
# git checkout -q -f -B kisskb 69bf4b6b54fb7f52b7ea9ce28d4a360cd5ec956d
# git clean -qxdf
# < git log -1
# commit 69bf4b6b54fb7f52b7ea9ce28d4a360cd5ec956d
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Fri Jul 5 19:55:18 2019 -0700
# 
#     Revert "mm: page cache: store only head pages in i_pages"
#     
#     This reverts commit 5fd4ca2d84b249f0858ce28cf637cf25b61a398f.
#     
#     Mikhail Gavrilov reports that it causes the VM_BUG_ON_PAGE() in
#     __delete_from_swap_cache() to trigger:
#     
#        page:ffffd6d34dff0000 refcount:1 mapcount:1 mapping:ffff97812323a689 index:0xfecec363
#        anon
#        flags: 0x17fffe00080034(uptodate|lru|active|swapbacked)
#        raw: 0017fffe00080034 ffffd6d34c67c508 ffffd6d3504b8d48 ffff97812323a689
#        raw: 00000000fecec363 0000000000000000 0000000100000000 ffff978433ace000
#        page dumped because: VM_BUG_ON_PAGE(entry != page)
#        page->mem_cgroup:ffff978433ace000
#        ------------[ cut here ]------------
#        kernel BUG at mm/swap_state.c:170!
#        invalid opcode: 0000 [#1] SMP NOPTI
#        CPU: 1 PID: 221 Comm: kswapd0 Not tainted 5.2.0-0.rc2.git0.1.fc31.x86_64 #1
#        Hardware name: System manufacturer System Product Name/ROG STRIX X470-I GAMING, BIOS 2202 04/11/2019
#        RIP: 0010:__delete_from_swap_cache+0x20d/0x240
#        Code: 30 65 48 33 04 25 28 00 00 00 75 4a 48 83 c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 c7 c6 2f dc 0f 8a 48 89 c7 e8 93 1b fd ff <0f> 0b 48 c7 c6 a8 74 0f 8a e8 85 1b fd ff 0f 0b 48 c7 c6 a8 7d 0f
#        RSP: 0018:ffffa982036e7980 EFLAGS: 00010046
#        RAX: 0000000000000021 RBX: 0000000000000040 RCX: 0000000000000006
#        RDX: 0000000000000000 RSI: 0000000000000086 RDI: ffff97843d657900
#        RBP: 0000000000000001 R08: ffffa982036e7835 R09: 0000000000000535
#        R10: ffff97845e21a46c R11: ffffa982036e7835 R12: ffff978426387120
#        R13: 0000000000000000 R14: ffffd6d34dff0040 R15: ffffd6d34dff0000
#        FS:  0000000000000000(0000) GS:ffff97843d640000(0000) knlGS:0000000000000000
#        CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
#        CR2: 00002cba88ef5000 CR3: 000000078a97c000 CR4: 00000000003406e0
#        Call Trace:
#         delete_from_swap_cache+0x46/0xa0
#         try_to_free_swap+0xbc/0x110
#         swap_writepage+0x13/0x70
#         pageout.isra.0+0x13c/0x350
#         shrink_page_list+0xc14/0xdf0
#         shrink_inactive_list+0x1e5/0x3c0
#         shrink_node_memcg+0x202/0x760
#         shrink_node+0xe0/0x470
#         balance_pgdat+0x2d1/0x510
#         kswapd+0x220/0x420
#         kthread+0xfb/0x130
#         ret_from_fork+0x22/0x40
#     
#     and it's not immediately obvious why it happens.  It's too late in the
#     rc cycle to do anything but revert for now.
#     
#     Link: https://lore.kernel.org/lkml/CABXGCsN9mYmBD-4GaaeW_NrDu+FDXLzr_6x+XNxfmFV6QkYCDg@mail.gmail.com/
#     Reported-and-bisected-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
#     Suggested-by: Jan Kara <jack@suse.cz>
#     Cc: Michal Hocko <mhocko@kernel.org>
#     Cc: Vlastimil Babka <vbabka@suse.cz>
#     Cc: Matthew Wilcox <willy@infradead.org>
#     Cc: Kirill Shutemov <kirill@shutemov.name>
#     Cc: William Kucharski <william.kucharski@oracle.com>
#     Cc: Andrew Morton <akpm@linux-foundation.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc --version
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-ld --version
# < git log --format=%s --max-count=1 69bf4b6b54fb7f52b7ea9ce28d4a360cd5ec956d
# < make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  allnoconfig
# make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-allnoconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-  
/kisskb/src/arch/mips/vdso/Makefile:39: MIPS VDSO requires binutils >= 2.25
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:194:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
FIT description: Linux 5.2.0-rc7+
Created:         Sat Jul  6 16:06:48 2019
 Image 0 (kernel@0)
  Description:  Linux 5.2.0-rc7+
  Created:      Sat Jul  6 16:06:48 2019
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    640769 Bytes = 625.75 KiB = 0.61 MiB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x8021e0a0
  Hash algo:    sha1
  Hash value:   ea8839a5fd7f706a011b66938bb3594926850cbf
 Default Configuration: 'conf@default'
 Configuration 0 (conf@default)
  Description:  Generic Linux kernel
  Kernel:       kernel@0
Completed OK
# rm -rf /kisskb/build/linus_mips-allnoconfig_mips
# Build took: 0:00:16.374747