linux-kernel - Re: [PATCH] utilities: add helper functions for safe 64-bit integer operations as 32-bit halves

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20070421220147.7144113e@the-village.bc.nu>
Date:	Sat, 21 Apr 2007 22:01:47 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"John Anthony Kazos Jr." <jakj@...-k-j.com>,
	James Bottomley <James.Bottomley@...elEye.com>,
	"Cameron, Steve" <Steve.Cameron@...com>,
	"Miller, Mike (OS Dev)" <Mike.Miller@...com>,
	Hisashi Hifumi <hifumi.hisashi@....ntt.co.jp>,
	jens.axboe@...cle.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, trivial@...nel.org
Subject: Re: [PATCH] utilities: add helper functions for safe 64-bit integer
 operations as 32-bit halves

> > +#define lower_32_bits(n) (sizeof(n) == 8 ? (u32)(n) : (n))
> 
> n&0xffffffff would be simpler.
> 
> Do we actually have any call for this?

The only case for all of this we care about is sector_t, which is one
type, with specific properties (eg always being positive). The rest is
over-engineering. Call it sector_upper32() do it the simple way and stop
trying to solve a problem we don't have
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/