Commit a672917a authored by Rabin Vincent's avatar Rabin Vincent Committed by Russell King

ARM: 8022/1: ftrace: work with CONFIG_DEBUG_SET_MODULE_RONX

Make ftrace work with CONFIG_DEBUG_SET_MODULE_RONX by making module text
writable around the place where ftrace does its work, like it is done on
x86 in the patch which introduced CONFIG_DEBUG_SET_MODULE_RONX,
84e1c6bb ("x86: Add RO/NX protection for loadable kernel modules").
Tested-by: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 603fb42a
...@@ -14,6 +14,7 @@ ...@@ -14,6 +14,7 @@
#include <linux/ftrace.h> #include <linux/ftrace.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <linux/module.h>
#include <asm/cacheflush.h> #include <asm/cacheflush.h>
#include <asm/opcodes.h> #include <asm/opcodes.h>
...@@ -63,6 +64,18 @@ static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr) ...@@ -63,6 +64,18 @@ static unsigned long adjust_address(struct dyn_ftrace *rec, unsigned long addr)
} }
#endif #endif
int ftrace_arch_code_modify_prepare(void)
{
set_all_modules_text_rw();
return 0;
}
int ftrace_arch_code_modify_post_process(void)
{
set_all_modules_text_ro();
return 0;
}
static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr) static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr)
{ {
return arm_gen_branch_link(pc, addr); return arm_gen_branch_link(pc, addr);
......
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