mm: Fix the flipped condition in gfpflags_allow_spinning()

JIRA: https://issues.redhat.com/browse/RHEL-78202

commit f90b474
Author: Vlastimil Babka <vbabka@suse.cz>
Date:   Mon Mar 10 13:40:17 2025 +0100

    mm: Fix the flipped condition in gfpflags_allow_spinning()

    The function gfpflags_allow_spinning() has a bug that makes it return
    the opposite result than intended. This could contribute to deadlocks as
    usage profilerates, for now it was noticed as a performance regression
    due to try_charge_memcg() not refilling memcg stock when it could. Fix
    the flipped condition.

    Fixes: 97769a5 ("mm, bpf: Introduce try_alloc_pages() for opportunistic page allocation")
    Reported-by: kernel test robot <oliver.sang@intel.com>
    Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
    Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
    Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
    Link: https://lore.kernel.org/bpf/20250310124017.187-1-alexei.starovoitov@gmail.com
    Closes: https://lore.kernel.org/oe-lkp/202503101254.cfd454df-lkp@intel.com
    Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Signed-off-by: Gregory Bell <grbell@redhat.com>

Author: Gbell26

include/linux/gfp.h

@@ -55,7 +55,7 @@ static inline bool gfpflags_allow_spinning(const gfp_t gfp_flags)
 	 * regular page allocator doesn't fully support this
 	 * allocation mode.
 	 */
-	return !(gfp_flags & __GFP_RECLAIM);
+	return !!(gfp_flags & __GFP_RECLAIM);
 }
 
 #ifdef CONFIG_HIGHMEM