5.15-stable patches

added patches:
	powerpc-ftrace-remove-ftrace-init-tramp-once-kernel-init-is-complete.patch

diff --git a/queue-5.15/powerpc-ftrace-remove-ftrace-init-tramp-once-kernel-init-is-complete.patch b/queue-5.15/powerpc-ftrace-remove-ftrace-init-tramp-once-kernel-init-is-complete.patch
new file mode 100644 (file)
index 0000000..ab06be1
--- /dev/null
+++ b/queue-5.15/powerpc-ftrace-remove-ftrace-init-tramp-once-kernel-init-is-complete.patch
@@ -0,0 +1,98 @@
+From 84ade0a6655bee803d176525ef457175cbf4df22 Mon Sep 17 00:00:00 2001
+From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
+Date: Mon, 16 May 2022 12:44:22 +0530
+Subject: powerpc/ftrace: Remove ftrace init tramp once kernel init is complete
+
+From: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
+
+commit 84ade0a6655bee803d176525ef457175cbf4df22 upstream.
+
+Stop using the ftrace trampoline for init section once kernel init is
+complete.
+
+Fixes: 67361cf8071286 ("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>
+---
+ arch/powerpc/include/asm/ftrace.h  |    4 +++-
+ arch/powerpc/kernel/trace/ftrace.c |   15 ++++++++++++---
+ arch/powerpc/mm/mem.c              |    2 ++
+ 3 files changed, 17 insertions(+), 4 deletions(-)
+
+--- a/arch/powerpc/include/asm/ftrace.h
++++ b/arch/powerpc/include/asm/ftrace.h
+@@ -96,7 +96,7 @@ static inline bool arch_syscall_match_sy
+ #endif /* PPC64_ELF_ABI_v1 */
+ #endif /* CONFIG_FTRACE_SYSCALLS */
+ 
+-#ifdef CONFIG_PPC64
++#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
+ #include <asm/paca.h>
+ 
+ static inline void this_cpu_disable_ftrace(void)
+@@ -120,11 +120,13 @@ static inline u8 this_cpu_get_ftrace_ena
+       return get_paca()->ftrace_enabled;
+ }
+ 
++void ftrace_free_init_tramp(void);
+ #else /* CONFIG_PPC64 */
+ static inline void this_cpu_disable_ftrace(void) { }
+ static inline void this_cpu_enable_ftrace(void) { }
+ static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
+ static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
++static inline void ftrace_free_init_tramp(void) { }
+ #endif /* CONFIG_PPC64 */
+ #endif /* !__ASSEMBLY__ */
+ 
+--- a/arch/powerpc/kernel/trace/ftrace.c
++++ b/arch/powerpc/kernel/trace/ftrace.c
+@@ -336,9 +336,7 @@ static int setup_mcount_compiler_tramp(u
+ 
+       /* 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? */
+@@ -881,6 +879,17 @@ 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;
+--- a/arch/powerpc/mm/mem.c
++++ b/arch/powerpc/mm/mem.c
+@@ -22,6 +22,7 @@
+ #include <asm/kasan.h>
+ #include <asm/svm.h>
+ #include <asm/mmzone.h>
++#include <asm/ftrace.h>
+ 
+ #include <mm/mmu_decl.h>
+ 
+@@ -314,6 +315,7 @@ void free_initmem(void)
+       mark_initmem_nx();
+       init_mem_is_free = true;
+       free_initmem_default(POISON_FREE_INITMEM);
++      ftrace_free_init_tramp();
+ }
+ 
+ /*

diff --git a/queue-5.15/series b/queue-5.15/series
index 7f3afc2d7f9a0267abfa7657edd988ae8307af02..cc90db73ce6519b0d4935231b79cd27b7c2f62e6 100644 (file)
--- a/queue-5.15/series
+++ b/queue-5.15/series
@@ -9,3 +9,4 @@ xfs-remove-all-cow-fork-extents-when-remounting-readonly.patch
 xfs-check-sb_meta_uuid-for-dabuf-buffer-recovery.patch
 xfs-prevent-uaf-in-xfs_log_item_in_current_chkpt.patch
 xfs-only-bother-with-sync_filesystem-during-readonly-remount.patch
+powerpc-ftrace-remove-ftrace-init-tramp-once-kernel-init-is-complete.patch