linux-kernel - Re: [git pull] sparc syscall stuff

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Date:   Sun, 8 Apr 2018 00:02:34 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        sparclinux@...r.kernel.org,
        Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: [git pull] sparc syscall stuff

On Sat, Apr 07, 2018 at 02:37:24PM -0700, Linus Torvalds wrote:
> On Sat, Apr 7, 2018 at 1:44 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> >         Conflicts in arch/sparc/kernel/sys_sparc32.c are not hard to resolve,
> > but keep in mind that casts to u64 are needed there.  I'd pushed a variant of
> > resolution into #test-merge.
> 
> You say "keep in mind that casts to u64 are needed there", but then
> you seem to be missing them yourself in your test merge (see
> [f]truncate64).
> 
> I only noticed because I decided to check my merge against yours. I
> strive to always do the merge resolution, but if people give me a test
> merge, I then double-check against it after-the-fack.
> 
> Hmm?

Merge fuckup; mine ;-/  FWIW, the corresponding part in my branch (in 3d0e354e4e51) is

-asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
+COMPAT_SYSCALL_DEFINE3(truncate64, const char __user *, path, u32, high, u32, low)
 {
-       if ((int)high < 0)
-               return -EINVAL;
-       else
-               return sys_truncate(path, (high << 32) | low);
+       return sys_truncate(path, ((u64)high << 32) | low);
 }

linux-next resolution is the right one -
git diff v4.16..HEAD -- arch/sparc/kernel/sys_sparc32.c
gives
-asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
+COMPAT_SYSCALL_DEFINE3(truncate64, const char __user *, path, u32, high, u32, low)
 {
-       if ((int)high < 0)
-               return -EINVAL;
-       else
-               return sys_truncate(path, (high << 32) | low);
+       return ksys_truncate(path, ((u64)high << 32) | low);
 }
etc. in there.  Again, my apologies.