Hi, > -----Original Message----- > From: Rafael J. Wysocki [mailto:rjw@xxxxxxxxxxxxx] > Sent: Thursday, September 29, 2016 8:25 PM > To: Stephen Rothwell > Cc: Thomas Gleixner; Ingo Molnar; H. Peter Anvin; Peter Zijlstra; linux- > next@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Denys Vlasenko; Chen, Yu > C > Subject: Re: linux-next: build failure after merge of the tip tree > > On Thursday, September 29, 2016 01:20:07 PM Stephen Rothwell wrote: > > Hi all, > > > > After merging the tip tree, today's linux-next build (x86_64 > > allmodconfig) failed like this: > > > > arch/x86/power/hibernate_64.c: In function 'hibernation_e820_save': > > arch/x86/power/hibernate_64.c:236:15: error: passing argument 1 of > 'get_e820_md5' from incompatible pointer type [-Werror=incompatible- > pointer-types] > > get_e820_md5(&e820_saved, buf); > > ^ > > arch/x86/power/hibernate_64.c:203:12: note: expected 'struct e820map *' > but argument is of type 'struct e820map **' > > static int get_e820_md5(struct e820map *map, void *buf) > > ^ > > arch/x86/power/hibernate_64.c: In function 'hibernation_e820_mismatch': > > arch/x86/power/hibernate_64.c:249:21: error: passing argument 1 of > 'get_e820_md5' from incompatible pointer type [-Werror=incompatible- > pointer-types] > > ret = get_e820_md5(&e820_saved, result); > > ^ > > arch/x86/power/hibernate_64.c:203:12: note: expected 'struct e820map *' > but argument is of type 'struct e820map **' > > static int get_e820_md5(struct e820map *map, void *buf) > > ^ > > > > Caused by commit > > > > 475339684ef1 ("x86/e820: Prepare e280 code for switch to dynamic > > storage") > > > > interacting with commit > > > > 6f95ad2b6162 ("PM / hibernate: Verify e820 memory map by MD5 > > digest") > > > > from the pm tree. > > > > I have applied the following merge fix patch: > > > > From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> > > Date: Thu, 29 Sep 2016 13:13:45 +1000 > > Subject: [PATCH] pm/hibernate: merge fix for type of e820_saved > > changing > > > > Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> > > --- > > arch/x86/power/hibernate_64.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/arch/x86/power/hibernate_64.c > > b/arch/x86/power/hibernate_64.c index 72f2c9531b03..904048f7a9c9 > > 100644 > > --- a/arch/x86/power/hibernate_64.c > > +++ b/arch/x86/power/hibernate_64.c > > @@ -233,7 +233,7 @@ static int get_e820_md5(struct e820map *map, void > > *buf) > > > > static void hibernation_e820_save(void *buf) { > > - get_e820_md5(&e820_saved, buf); > > + get_e820_md5(e820_saved, buf); > > } > > > > static bool hibernation_e820_mismatch(void *buf) @@ -246,7 +246,7 @@ > > static bool hibernation_e820_mismatch(void *buf) > > if (!memcmp(result, buf, MD5_DIGEST_SIZE)) > > return false; > > > > - ret = get_e820_md5(&e820_saved, result); > > + ret = get_e820_md5(e820_saved, result); > > if (ret) > > return true; > > > > > > Looks good to me, thanks Stephen! > > Rafael Thanks for the fix! I made a double check of the patch : "x86/e820: Prepare e280 code for switch to dynamic storage" It looks like this patch has reallocate the e820 & e820_save to their actual size: + size = offsetof(struct e820map, map) + sizeof(struct e820entry) * e820->nr_map; + n = kmalloc(size, GFP_KERNEL); however the previous patch to verify the md5 hash during hibernation will use the original e820_map structure by sizeof(struct e820map), which might read invalid value after the latest patch applied. I think I need to modify the hibernation e820 checking patch to only generate md5 digest based on the actual e820_save size by sizeof(struct e820entry) * e820->nr_map. I don't have a machine in hand now, will test later and give feedback later. Thanks again! Yu ��.n��������+%������w��{.n�����{��w����ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
