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powerpc/ftrace: Remove ftrace init tramp once kernel init is complete

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commit 84ade0a6655bee803d176525ef457175cbf4df22 upstream.

Stop using the ftrace trampoline for init section once kernel init is
complete.

Fixes: 67361cf807 ("powerpc/ftrace: Handle large kernel configs")
Cc: stable@vger.kernel.org # v4.20+
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220516071422.463738-1-naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen N. Rao
2022-05-16 12:44:22 +05:30
committed by Greg Kroah-Hartman
parent 6b734f7b70
commit 6a656280e7
3 changed files with 17 additions and 4 deletions
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15
arch/powerpc/kernel/trace/ftrace.c
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@@ -336,9 +336,7 @@ static int setup_mcount_compiler_tramp(unsigned long tramp)
/* Is this a known long jump tramp? */
for (i = 0; i < NUM_FTRACE_TRAMPS; i++)
if (!ftrace_tramps[i])
break;
else if (ftrace_tramps[i] == tramp)
if (ftrace_tramps[i] == tramp)
return 0;
/* Is this a known plt tramp? */
@@ -882,6 +880,17 @@ void arch_ftrace_update_code(int command)
extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
void ftrace_free_init_tramp(void)
{
int i;
for (i = 0; i < NUM_FTRACE_TRAMPS && ftrace_tramps[i]; i++)
if (ftrace_tramps[i] == (unsigned long)ftrace_tramp_init) {
ftrace_tramps[i] = 0;
return;
}
}
int __init ftrace_dyn_arch_init(void)
{
int i;