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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0a487aad2d
Initially, we were trying to guard against scenarios where somebody attaches to the system with a hardware debugger while PT is enabled from software and pt_is_running() tries to make sure we handle this better, but the truth is, there is still a race window no matter what and people with hardware debuggers should really know what they are doing anyway. In other words, there is no point in keeping this one around, and it's one RDMSR instructions fewer in the fast path. The case when PT is enabled by the BIOS at boot time is handled in the driver initialization path and doesn't use pt_is_running(). This patch gets rid of it. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: acme@infradead.org Cc: adrian.hunter@intel.com Cc: hpa@zytor.com Link: http://lkml.kernel.org/r/1429622177-22843-6-git-send-email-alexander.shishkin@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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