Re: [PATCH v4 8/9] Implement kernel live patching for ppc64le (ABIv2)
From: Petr Mladek <pmladek@suse.com>
Date: 2015-12-03 16:24:48
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On Wed 2015-11-25 17:48:36, Torsten Duwe wrote:
quoted hunk ↗ jump to hunk
* create the appropriate files+functions arch/powerpc/include/asm/livepatch.h klp_check_compiler_support, klp_arch_set_pc arch/powerpc/kernel/livepatch.c with a stub for klp_write_module_reloc This is architecture-independent work in progress. * introduce a fixup in arch/powerpc/kernel/entry_64.S for local calls that are becoming global due to live patching. And of course do the main KLP thing: return to a maybe different address, possibly altered by the live patching ftrace op.--- /dev/null +++ b/arch/powerpc/include/asm/livepatch.h@@ -0,0 +1,45 @@
[...]
+#include <linux/module.h>
+#include <linux/ftrace.h>
+
+#ifdef CONFIG_LIVEPATCH
+static inline int klp_check_compiler_support(void)
+{
+#if !defined(_CALL_ELF) || _CALL_ELF != 2I am just curious why we do not check CC_USING_MPROFILE_KERNEL like in the other similar locations. It would look less cryptic. But I am not sure if it is precise enough. Best Regards, Petr
+ return 1; +#endif + return 0; +} +