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| author | Jeff Dike <jdike@addtoit.com> | 2006-09-25 23:33:08 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:49:09 -0700 |
| commit | 75e29b18d9a46bf3193278e92dc95609a8cca2ab (patch) | |
| tree | 413935160ac2f65c13ec5260a60cdd1d9259fd83 /include/asm-um | |
| parent | bf61f50d63b4d9e30d7a86a2d44bb300ae7c1dd4 (diff) | |
| download | linux-75e29b18d9a46bf3193278e92dc95609a8cca2ab.tar.gz linux-75e29b18d9a46bf3193278e92dc95609a8cca2ab.tar.bz2 linux-75e29b18d9a46bf3193278e92dc95609a8cca2ab.zip | |
[PATCH] uml: stack usage reduction
The KSTK_* macros used an inordinate amount of stack. In order to overcome
an impedance mismatch between their interface, which just returns a single
register value, and the interface of get_thread_regs, which took a full
pt_regs, the implementation created an on-stack pt_regs, filled it in, and
returned one field. do_task_stat calls KSTK_* twice, resulting in two
local pt_regs, blowing out the stack.
This patch changes the interface (and name) of get_thread_regs to just
return a single register from a jmp_buf.
The include of archsetjmp.h" in registers.h to get the definition of
jmp_buf exposed a bogus include of <setjmp.h> in start_up.c. <setjmp.h>
shouldn't be used anywhere any more since UML uses the klibc
setjmp/longjmp.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-um')
| -rw-r--r-- | include/asm-um/processor-generic.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/include/asm-um/processor-generic.h b/include/asm-um/processor-generic.h index 824c28896382..afa4fe1ca9f1 100644 --- a/include/asm-um/processor-generic.h +++ b/include/asm-um/processor-generic.h @@ -138,9 +138,7 @@ extern struct cpuinfo_um cpu_data[]; #ifdef CONFIG_MODE_SKAS #define KSTK_REG(tsk, reg) \ - ({ union uml_pt_regs regs; \ - get_thread_regs(®s, tsk->thread.mode.skas.switch_buf); \ - UPT_REG(®s, reg); }) + get_thread_reg(reg, tsk->thread.mode.skas.switch_buf) #else #define KSTK_REG(tsk, reg) (0xbadbabe) #endif |