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authorDave Hansen <dave.hansen@linux.intel.com>2015-06-07 21:37:04 +0300
committerIngo Molnar <mingo@kernel.org>2015-06-09 13:24:32 +0300
commitb0e9b09b3bd64e67bba862e238d3757b2482b6de (patch)
tree8f5129ba0ba7e23bd4d913388885cd49c57045f6 /arch/x86/kernel/uprobes.c
parentcd4996dce18b619bd7b3acf75c91f49c77f05a97 (diff)
downloadlinux-b0e9b09b3bd64e67bba862e238d3757b2482b6de.tar.xz
x86: Make is_64bit_mm() widely available
The uprobes code has a nice helper, is_64bit_mm(), that consults both the runtime and compile-time flags for 32-bit support. Instead of reinventing the wheel, pull it in to an x86 header so we can use it for MPX. I prefer passing the 'mm' around to test_thread_flag(TIF_IA32) because it makes it explicit where the context is coming from. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dave Hansen <dave@sr71.net> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20150607183704.F0209999@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/uprobes.c')
-rw-r--r--arch/x86/kernel/uprobes.c10
1 files changed, 1 insertions, 9 deletions
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 0b81ad67da07..66476244731e 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -29,6 +29,7 @@
#include <linux/kdebug.h>
#include <asm/processor.h>
#include <asm/insn.h>
+#include <asm/mmu_context.h>
/* Post-execution fixups. */
@@ -312,11 +313,6 @@ static int uprobe_init_insn(struct arch_uprobe *auprobe, struct insn *insn, bool
}
#ifdef CONFIG_X86_64
-static inline bool is_64bit_mm(struct mm_struct *mm)
-{
- return !config_enabled(CONFIG_IA32_EMULATION) ||
- !(mm->context.ia32_compat == TIF_IA32);
-}
/*
* If arch_uprobe->insn doesn't use rip-relative addressing, return
* immediately. Otherwise, rewrite the instruction so that it accesses
@@ -497,10 +493,6 @@ static void riprel_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
}
}
#else /* 32-bit: */
-static inline bool is_64bit_mm(struct mm_struct *mm)
-{
- return false;
-}
/*
* No RIP-relative addressing on 32-bit
*/