WSL2-Linux-Kernel/fs/proc
Linus Torvalds ee568b25ee Avoid 64-bit "switch()" statements on 32-bit architectures
Commit ee6f779b9e ("filp->f_pos not
correctly updated in proc_task_readdir") changed the proc code to use
filp->f_pos directly, rather than through a temporary variable.  In the
process, that caused the operations to be done on the full 64 bits, even
though the offset is never that big.

That's all fine and dandy per se, but for some unfathomable reason gcc
generates absolutely horrid code when using 64-bit values in switch()
statements.  To the point of actually calling out to gcc helper
functions like __cmpdi2 rather than just doing the trivial comparisons
directly the way gcc does for normal compares.  At which point we get
link failures, because we really don't want to support that kind of
crazy code.

Fix this by just casting the f_pos value to "unsigned long", which
is plenty big enough for /proc, and avoids the gcc code generation issue.

Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Zhang Le <r0bertz@gentoo.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-17 10:02:35 -07:00
..
Kconfig proc: move PROC_PAGE_MONITOR to fs/proc/Kconfig 2008-10-10 04:18:57 +04:00
Makefile proc: remove fs/proc/proc_misc.c 2008-10-23 18:54:05 +04:00
array.c CRED: Use RCU to access another task's creds and to release a task's own creds 2008-11-14 10:39:19 +11:00
base.c Avoid 64-bit "switch()" statements on 32-bit architectures 2009-03-17 10:02:35 -07:00
cmdline.c proc: switch /proc/cmdline to seq_file 2008-10-23 14:29:04 +04:00
cpuinfo.c proc: move /proc/cpuinfo code to fs/proc/cpuinfo.c 2008-10-23 15:05:11 +04:00
devices.c proc: move /proc/devices code to fs/proc/devices.c 2008-10-23 15:02:18 +04:00
generic.c proc: stop using BKL 2009-01-05 12:27:44 +03:00
inode-alloc.txt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
inode.c proc: proc_get_inode should de_put when inode already initialized 2009-02-23 18:25:32 -08:00
internal.h NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
interrupts.c proc: move /proc/interrupts boilerplate code to fs/proc/interrupts.c 2008-10-23 15:15:46 +04:00
kcore.c proc: move all /proc/kcore stuff to fs/proc/kcore.c 2008-10-23 18:32:38 +04:00
kmsg.c proc: move /proc/kmsg creation to fs/proc/kmsg.c 2008-10-23 14:35:08 +04:00
loadavg.c proc: switch /proc/loadavg to seq_file 2008-10-23 13:45:28 +04:00
meminfo.c NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
mmu.c fs/proc/mmu.c: headers butchery 2007-10-17 08:42:48 -07:00
nommu.c NOMMU: Make VMAs per MM as for MMU-mode linux 2009-01-08 12:04:47 +00:00
page.c proc: fix kflags to uflags copying in /proc/kpageflags 2009-03-11 07:43:33 -07:00
proc_devtree.c powerpc: Remove `have_of' global variable 2008-12-16 15:52:57 +11:00
proc_net.c proc: stop using BKL 2009-01-05 12:27:44 +03:00
proc_sysctl.c zero i_uid/i_gid on inode allocation 2009-01-05 11:54:28 -05:00
proc_tty.c tty: Ldisc revamp 2008-07-20 17:12:34 -07:00
root.c proc: stop using BKL 2009-01-05 12:27:44 +03:00
stat.c proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c 2008-12-26 09:48:18 +01:00
task_mmu.c mm: report the MMU pagesize in /proc/pid/smaps 2009-01-06 15:58:58 -08:00
task_nommu.c NOMMU: Improve procfs output using per-MM VMAs 2009-01-08 12:04:47 +00:00
uptime.c proc: revert /proc/uptime to ->read_proc hook 2008-10-27 22:56:56 +03:00
version.c proc: switch /proc/version to seq_file 2008-10-23 14:19:58 +04:00
vmcore.c vmcore: remove saved_max_pfn check 2009-01-08 08:31:14 -08:00