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Message-ID: <1413154885.22149.49.camel@joe-AO725> Date: Sun, 12 Oct 2014 16:01:25 -0700 From: Joe Perches <joe@...ches.com> To: Mike Roocroft <mike.linux@...nternet.com> Cc: herbert@...dor.apana.org.au, davem@...emloft.net, linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] Crypto: gf128mul : fixed a parentheses coding style issue On Sun, 2014-10-12 at 21:49 +0100, Mike Roocroft wrote: > Fixed a coding style issue. [] > diff --git a/crypto/gf128mul.c b/crypto/gf128mul.c [] > @@ -97,7 +97,7 @@ > the table above > */ > > -#define xx(p, q) 0x##p##q > +#define xx(p, q) (0x##p##q) > > #define xda_bbe(i) ( \ > (i & 0x80 ? xx(43, 80) : 0) ^ (i & 0x40 ? xx(21, c0) : 0) ^ \ I think that macro is pretty useless and nothing but obfuscation now. The comment above it doesn't seem useful either. How about just removing and replacing the uses like this? --- crypto/gf128mul.c | 27 ++++++++------------------- 1 file changed, 8 insertions(+), 19 deletions(-) diff --git a/crypto/gf128mul.c b/crypto/gf128mul.c index 5276607..90cf17d 100644 --- a/crypto/gf128mul.c +++ b/crypto/gf128mul.c @@ -88,29 +88,18 @@ q(0xf8), q(0xf9), q(0xfa), q(0xfb), q(0xfc), q(0xfd), q(0xfe), q(0xff) \ } -/* Given the value i in 0..255 as the byte overflow when a field element - in GHASH is multiplied by x^8, this function will return the values that - are generated in the lo 16-bit word of the field value by applying the - modular polynomial. The values lo_byte and hi_byte are returned via the - macro xp_fun(lo_byte, hi_byte) so that the values can be assembled into - memory as required by a suitable definition of this macro operating on - the table above -*/ - -#define xx(p, q) 0x##p##q - #define xda_bbe(i) ( \ - (i & 0x80 ? xx(43, 80) : 0) ^ (i & 0x40 ? xx(21, c0) : 0) ^ \ - (i & 0x20 ? xx(10, e0) : 0) ^ (i & 0x10 ? xx(08, 70) : 0) ^ \ - (i & 0x08 ? xx(04, 38) : 0) ^ (i & 0x04 ? xx(02, 1c) : 0) ^ \ - (i & 0x02 ? xx(01, 0e) : 0) ^ (i & 0x01 ? xx(00, 87) : 0) \ + (i & 0x80 ? 0x4380 : 0) ^ (i & 0x40 ? 0x21c0 : 0) ^ \ + (i & 0x20 ? 0x10e0 : 0) ^ (i & 0x10 ? 0x0870 : 0) ^ \ + (i & 0x08 ? 0x0438 : 0) ^ (i & 0x04 ? 0x021c : 0) ^ \ + (i & 0x02 ? 0x010e : 0) ^ (i & 0x01 ? 0x0087 : 0) \ ) #define xda_lle(i) ( \ - (i & 0x80 ? xx(e1, 00) : 0) ^ (i & 0x40 ? xx(70, 80) : 0) ^ \ - (i & 0x20 ? xx(38, 40) : 0) ^ (i & 0x10 ? xx(1c, 20) : 0) ^ \ - (i & 0x08 ? xx(0e, 10) : 0) ^ (i & 0x04 ? xx(07, 08) : 0) ^ \ - (i & 0x02 ? xx(03, 84) : 0) ^ (i & 0x01 ? xx(01, c2) : 0) \ + (i & 0x80 ? 0xe100 : 0) ^ (i & 0x40 ? 0x7080 : 0) ^ \ + (i & 0x20 ? 0x3840 : 0) ^ (i & 0x10 ? 0x1c20 : 0) ^ \ + (i & 0x08 ? 0x0e10 : 0) ^ (i & 0x04 ? 0x0708 : 0) ^ \ + (i & 0x02 ? 0x0384 : 0) ^ (i & 0x01 ? 0x01c2 : 0) \ ) static const u16 gf128mul_table_lle[256] = gf128mul_dat(xda_lle); -- 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/
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