Re: [PATCH 4.4] x86/kaiser: fix build error with KASAN && !FUNCTION_GRAPH_TRACER

On Sat, Feb 10, 2018 at 04:08:16PM -0800, Hugh Dickins wrote:

On Fri, 9 Feb 2018, Eric Biggers wrote:

...

This is a build fix for the 4.4 PTI backport. 4.4 kernels do not have commit be7635e7287e ("arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections") which went into 4.6. Consequently, the irqentry sections are only created when CONFIG_FUNCTION_GRAPH_TRACER is enabled, not also when CONFIG_KASAN is enabled. Therefore, fix the condition for trying to add a user mapping for this section.

This fixes the following build error:

arch/x86/mm/kaiser.c: In function ‘kaiser_init’:
arch/x86/mm/kaiser.c:367:33: error: ‘__irqentry_text_start’ undeclared (first use in this function)
  kaiser_add_user_map_ptrs_early(__irqentry_text_start,
[...]

Signed-off-by: Eric Biggers ebiggers@google.com

Yep, sorry about that, thanks Eric: Acked-by: Hugh Dickins hughd@google.com

Thanks, now queued up.

greg k-h