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If reserve_real_mode() fails, panicing immediately means we're doomed. Make it safe to try more than once to allocate the trampoline: - Degrade a failure from panic() to pr_info(). (If we make it to setup_real_mode() without reserving the trampoline, we'll panic them.) - Factor out helpers so that platform code can supply a specific address to try. - Warn if reserve_real_mode() is called after we're done with the memblock allocator. If that were to happen, we would behave unpredictably. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mario Limonciello <mario_limonciello@dell.com> Cc: Matt Fleming <mfleming@suse.de> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/876e383038f3e9971aa72fd20a4f5da05f9d193d.1470821230.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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