WSL2-Linux-Kernel/arch/x86
Roland McGrath 54a0151041 asmlinkage_protect replaces prevent_tail_call
The prevent_tail_call() macro works around the problem of the compiler
clobbering argument words on the stack, which for asmlinkage functions
is the caller's (user's) struct pt_regs.  The tail/sibling-call
optimization is not the only way that the compiler can decide to use
stack argument words as scratch space, which we have to prevent.
Other optimizations can do it too.

Until we have new compiler support to make "asmlinkage" binding on the
compiler's own use of the stack argument frame, we have work around all
the manifestations of this issue that crop up.

More cases seem to be prevented by also keeping the incoming argument
variables live at the end of the function.  This makes their original
stack slots attractive places to leave those variables, so the compiler
tends not clobber them for something else.  It's still no guarantee, but
it handles some observed cases that prevent_tail_call() did not.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-10 17:28:26 -07:00
..
boot x86-boot: don't request VBE2 information 2008-03-07 16:39:14 +01:00
configs x86, core: remove CONFIG_FORCED_INLINING 2008-02-09 23:24:09 +01:00
crypto [CRYPTO] twofish: Merge common glue code 2008-01-14 17:07:57 +11:00
ia32 x86: clear DF before calling signal handler 2008-03-07 16:39:14 +01:00
kernel asmlinkage_protect replaces prevent_tail_call 2008-04-10 17:28:26 -07:00
kvm KVM: MMU: Fix memory leak on guest demand faults 2008-03-25 10:22:17 +02:00
lguest lguest: comment documentation update. 2008-03-28 11:05:54 +11:00
lib x86: clean up csum-wrappers_64.c some more 2008-02-19 16:18:32 +01:00
mach-default spelling fixes: arch/i386/ 2007-10-20 01:13:56 +02:00
mach-es7000 i386: es7000 minor cleanups 2007-10-17 20:16:15 +02:00
mach-generic spelling fixes: arch/i386/ 2007-10-20 01:13:56 +02:00
mach-rdc321x rdc321x: GPIO routines bugfixes 2008-03-27 16:08:45 +01:00
mach-visws x86/visws: fix printk format warnings 2008-03-21 17:06:15 +01:00
mach-voyager calibrate_delay() must be __cpuinit 2008-02-06 10:41:08 -08:00
math-emu x86: arch/x86/math-emu/errors.c: fix printk warnings 2008-01-30 13:32:13 +01:00
mm Avoid false positive warnings in kmap_atomic_prot() with DEBUG_HIGHMEM 2008-03-28 13:08:14 -07:00
oprofile x86: rename stack_pointer to kernel_trap_sp 2008-01-30 13:33:16 +01:00
pci fix BIOS PCI config cycle buglet causing ACPI boot regression 2008-03-10 18:09:05 -07:00
power x86 cleanup: suspend_asm_64.S - use X86_CR4_PGE instead of numeric value 2008-02-19 16:18:33 +01:00
vdso x86 vdso: fix build locale dependency 2008-02-29 18:55:39 +01:00
video i386: move video 2007-10-11 11:16:56 +02:00
xen xen: Clear PG_pinned in release_{pt,pd}() 2008-04-04 18:36:48 +02:00
Kconfig documentation: Move power-related files to Documentation/power/ 2008-03-12 18:10:51 -04:00
Kconfig.cpu x86: a P4 is a P6 not an i486 2008-03-04 11:55:34 -08:00
Kconfig.debug x86: change IO delay back to 0x80 2008-02-19 16:18:34 +01:00
Makefile x86: fix vdso_install breaks user "make install" 2008-02-19 16:18:34 +01:00
Makefile_32.cpu x86: move i386 and x86_64 Makefiles to arch/x86 2007-10-25 22:27:34 +02:00