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authorVlastimil Babka <vbabka@suse.cz>2018-08-23 16:21:29 +0200
committerThomas Gleixner <tglx@linutronix.de>2018-08-24 15:55:17 +0200
commit6a012288d6906fee1dbc244050ade1dafe4a9c8d (patch)
tree17fddd5df13eec3bfa5731fa6619bad7c26418c3 /tools/perf/util/srcline.h
parentx86/speculation/l1tf: Fix off-by-one error when warning that system has too m... (diff)
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x86/speculation/l1tf: Suggest what to do on systems with too much RAM
Two users have reported [1] that they have an "extremely unlikely" system with more than MAX_PA/2 memory and L1TF mitigation is not effective. Make the warning more helpful by suggesting the proper mem=X kernel boot parameter to make it effective and a link to the L1TF document to help decide if the mitigation is worth the unusable RAM. [1] https://bugzilla.suse.com/show_bug.cgi?id=1105536 Suggested-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Michal Hocko <mhocko@suse.com> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/966571f0-9d7f-43dc-92c6-a10eec7a1254@suse.cz
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