linux-kernel - [PATCH v2 4/9] proc/vmcore: let pfn_is

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Date:   Tue,  5 Oct 2021 14:14:25 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Mike Rapoport <rppt@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, x86@...nel.org,
        xen-devel@...ts.xenproject.org,
        virtualization@...ts.linux-foundation.org,
        kexec@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org
Subject: [PATCH v2 4/9] proc/vmcore: let pfn_is_ram() return a bool

The callback should deal with errors internally, it doesn't make sense to
expose these via pfn_is_ram(). We'll rework the callbacks next. Right now
we consider errors as if "it's RAM"; no functional change.

Signed-off-by: David Hildenbrand <david@...hat.com>
---
 fs/proc/vmcore.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 9a15334da208..a9bd80ab670e 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -84,11 +84,11 @@ void unregister_oldmem_pfn_is_ram(void)
 }
 EXPORT_SYMBOL_GPL(unregister_oldmem_pfn_is_ram);
 
-static int pfn_is_ram(unsigned long pfn)
+static bool pfn_is_ram(unsigned long pfn)
 {
 	int (*fn)(unsigned long pfn);
 	/* pfn is ram unless fn() checks pagetype */
-	int ret = 1;
+	bool ret = true;
 
 	/*
 	 * Ask hypervisor if the pfn is really ram.
@@ -97,7 +97,7 @@ static int pfn_is_ram(unsigned long pfn)
 	 */
 	fn = oldmem_pfn_is_ram;
 	if (fn)
-		ret = fn(pfn);
+		ret = !!fn(pfn);
 
 	return ret;
 }
@@ -124,7 +124,7 @@ ssize_t read_from_oldmem(char *buf, size_t count,
 			nr_bytes = count;
 
 		/* If pfn is not ram, return zeros for sparse dump files */
-		if (pfn_is_ram(pfn) == 0)
+		if (!pfn_is_ram(pfn))
 			memset(buf, 0, nr_bytes);
 		else {
 			if (encrypted)
-- 
2.31.1