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authorJeff Dike <jdike@addtoit.com>2006-09-25 23:33:08 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 08:49:09 -0700
commit75e29b18d9a46bf3193278e92dc95609a8cca2ab (patch)
tree413935160ac2f65c13ec5260a60cdd1d9259fd83 /include/asm-um
parentbf61f50d63b4d9e30d7a86a2d44bb300ae7c1dd4 (diff)
[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.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/include/asm-um/processor-generic.h b/include/asm-um/processor-generic.h
index 824c2889638..afa4fe1ca9f 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(&regs, tsk->thread.mode.skas.switch_buf); \
- UPT_REG(&regs, reg); })
+ get_thread_reg(reg, tsk->thread.mode.skas.switch_buf)
#else
#define KSTK_REG(tsk, reg) (0xbadbabe)
#endif