From: Mike Rapoport <rppt@kernel•org>
To: Andrew Morton <akpm@linux-foundation•org>
Cc: Andreas Larsson <andreas@gaisler•com>,
Andy Lutomirski <luto@kernel•org>, Arnd Bergmann <arnd@arndb•de>,
Borislav Petkov <bp@alien8•de>, Brian Cain <bcain@quicinc•com>,
Catalin Marinas <catalin.marinas@arm•com>,
Christoph Hellwig <hch@infradead•org>,
Christophe Leroy <christophe.leroy@csgroup•eu>,
Dave Hansen <dave.hansen@linux•intel.com>,
Dinh Nguyen <dinguyen@kernel•org>,
Geert Uytterhoeven <geert@linux-m68k•org>,
Guo Ren <guoren@kernel•org>, Helge Deller <deller@gmx•de>,
Huacai Chen <chenhuacai@kernel•org>,
Ingo Molnar <mingo@redhat•com>,
Johannes Berg <johannes@sipsolutions•net>,
John Paul Adrian Glaubitz <glaubitz@physik•fu-berlin.de>,
Kent Overstreet <kent.overstreet@linux•dev>,
"Liam R. Howlett" <Liam.Howlett@oracle•com>,
Luis Chamberlain <mcgrof@kernel•org>,
Mark Rutland <mark.rutland@arm•com>,
Masami Hiramatsu <mhiramat@kernel•org>,
Matt Turner <mattst88@gmail•com>,
Max Filippov <jcmvbkbc@gmail•com>,
Michael Ellerman <mpe@ellerman•id.au>,
Michal Simek <monstr@monstr•eu>, Mike Rapoport <rppt@kernel•org>,
Oleg Nesterov <oleg@redhat•com>,
Palmer Dabbelt <palmer@dabbelt•com>,
Peter Zijlstra <peterz@infradead•org>,
Richard Weinberger <richard@nod•at>,
Russell King <linux@armlinux•org.uk>, Song Liu <song@kernel•org>,
Stafford Horne <shorne@gmail•com>,
Steven Rostedt <rostedt@goodmis•org>,
Thomas Bogendoerfer <tsbogend@alpha•franken.de>,
Thomas Gleixner <tglx@linutronix•de>,
Uladzislau Rezki <urezki@gmail•com>,
Vineet Gupta <vgupta@kernel•org>, Will Deacon <will@kernel•org>,
bpf@vger•kernel.org, linux-alpha@vger•kernel.org,
linux-arch@vger•kernel.org, linux-arm-kernel@lists•infradead.org,
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linux-parisc@vger•kernel.org, linux-riscv@lists•infradead.org,
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linuxppc-dev@lists•ozlabs.org, loongarch@lists•linux.dev,
sparclinux@vger•kernel.org, x86@kernel•org
Subject: [PATCH v3 5/8] ftrace: Add swap_func to ftrace_process_locs()
Date: Mon, 9 Sep 2024 09:47:27 +0300 [thread overview]
Message-ID: <20240909064730.3290724-6-rppt@kernel.org> (raw)
In-Reply-To: <20240909064730.3290724-1-rppt@kernel.org>
From: Song Liu <song@kernel•org>
ftrace_process_locs sorts module mcount, which is inside RO memory. Add a
ftrace_swap_func so that archs can use RO-memory-poke function to do the
sorting.
Signed-off-by: Song Liu <song@kernel•org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel•org>
---
include/linux/ftrace.h | 2 ++
kernel/trace/ftrace.c | 19 ++++++++++++++++++-
2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index fd5e84d0ec47..b794dcb7cae8 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -1188,4 +1188,6 @@ unsigned long arch_syscall_addr(int nr);
#endif /* CONFIG_FTRACE_SYSCALLS */
+void ftrace_swap_func(void *a, void *b, int n);
+
#endif /* _LINUX_FTRACE_H */
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 4c28dd177ca6..95bb9b52ab36 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -6989,6 +6989,23 @@ static void test_is_sorted(unsigned long *start, unsigned long count)
}
#endif
+/*
+ * ftrace_process_locs sorts module mcount, which might be inside RO
+ * memory.
+ * ftrace_swap_func allows architectures to use RO-memory-poke function to
+ * do the sorting.
+ */
+void __weak ftrace_swap_func(void *a, void *b, int n)
+{
+ unsigned long t;
+
+ WARN_ON_ONCE(n != sizeof(t));
+
+ t = *((unsigned long *)a);
+ *(unsigned long *)a = *(unsigned long *)b;
+ *(unsigned long *)b = t;
+}
+
static int ftrace_process_locs(struct module *mod,
unsigned long *start,
unsigned long *end)
@@ -7016,7 +7033,7 @@ static int ftrace_process_locs(struct module *mod,
*/
if (!IS_ENABLED(CONFIG_BUILDTIME_MCOUNT_SORT) || mod) {
sort(start, count, sizeof(*start),
- ftrace_cmp_ips, NULL);
+ ftrace_cmp_ips, ftrace_swap_func);
} else {
test_is_sorted(start, count);
}
--
2.43.0
next prev parent reply other threads:[~2024-09-09 6:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-09 6:47 [PATCH v3 0/8] x86/module: use large ROX pages for text allocations Mike Rapoport
2024-09-09 6:47 ` [PATCH v3 1/8] mm: vmalloc: group declarations depending on CONFIG_MMU together Mike Rapoport
2024-09-09 6:47 ` [PATCH v3 2/8] mm: vmalloc: don't account for number of nodes for HUGE_VMAP allocations Mike Rapoport
2024-09-09 6:47 ` [PATCH v3 3/8] asm-generic: introduce text-patching.h Mike Rapoport
2024-09-09 6:47 ` [PATCH v3 4/8] module: prepare to handle ROX allocations for text Mike Rapoport
2024-09-09 6:47 ` Mike Rapoport [this message]
2024-09-09 6:47 ` [PATCH v3 6/8] x86/module: perpare module loading for ROX allocations of text Mike Rapoport
2024-09-09 9:29 ` Peter Zijlstra
2024-09-09 14:34 ` Mike Rapoport
2024-09-09 14:49 ` Steven Rostedt
2024-09-11 10:19 ` Mike Rapoport
2024-09-09 6:47 ` [PATCH v3 7/8] execmem: add support for cache of large ROX pages Mike Rapoport
2024-09-13 15:00 ` Ard Biesheuvel
2024-09-15 13:48 ` Mike Rapoport
2024-09-19 11:18 ` Liam R. Howlett
2024-09-09 6:47 ` [PATCH v3 8/8] x86/module: enable ROX caches for module text Mike Rapoport
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