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Date:   Sun, 16 Sep 2018 07:01:47 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-crypto@...r.kernel.org,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        "Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH net-next v4 20/20] net: WireGuard secure network tunnel

Hi Jason,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Jason-A-Donenfeld/WireGuard-Secure-Network-Tunnel/20180916-043623
config: x86_64-randconfig-b0-09160521 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from lib/zinc/curve25519/curve25519.c:45:0:
   lib/zinc/curve25519/curve25519-hacl64.h: In function 'curve25519_generic':
>> lib/zinc/curve25519/curve25519-hacl64.h:785:1: warning: the frame size of 13216 bytes is larger than 8192 bytes [-Wframe-larger-than=]
    }
    ^

vim +785 lib/zinc/curve25519/curve25519-hacl64.h

cec5aa7c Jason A. Donenfeld 2018-09-14  755  
cec5aa7c Jason A. Donenfeld 2018-09-14  756  static void curve25519_generic(u8 mypublic[CURVE25519_POINT_SIZE],
cec5aa7c Jason A. Donenfeld 2018-09-14  757  			       const u8 secret[CURVE25519_POINT_SIZE],
cec5aa7c Jason A. Donenfeld 2018-09-14  758  			       const u8 basepoint[CURVE25519_POINT_SIZE])
cec5aa7c Jason A. Donenfeld 2018-09-14  759  {
cec5aa7c Jason A. Donenfeld 2018-09-14  760  	u64 buf0[10] __aligned(32) = { 0 };
cec5aa7c Jason A. Donenfeld 2018-09-14  761  	u64 *x0 = buf0;
cec5aa7c Jason A. Donenfeld 2018-09-14  762  	u64 *z = buf0 + 5;
cec5aa7c Jason A. Donenfeld 2018-09-14  763  	u64 *q;
cec5aa7c Jason A. Donenfeld 2018-09-14  764  	format_fexpand(x0, basepoint);
cec5aa7c Jason A. Donenfeld 2018-09-14  765  	z[0] = 1;
cec5aa7c Jason A. Donenfeld 2018-09-14  766  	q = buf0;
cec5aa7c Jason A. Donenfeld 2018-09-14  767  	{
cec5aa7c Jason A. Donenfeld 2018-09-14  768  		u8 e[32] __aligned(32) = { 0 };
cec5aa7c Jason A. Donenfeld 2018-09-14  769  		u8 *scalar;
cec5aa7c Jason A. Donenfeld 2018-09-14  770  		memcpy(e, secret, 32);
cec5aa7c Jason A. Donenfeld 2018-09-14  771  		normalize_secret(e);
cec5aa7c Jason A. Donenfeld 2018-09-14  772  		scalar = e;
cec5aa7c Jason A. Donenfeld 2018-09-14  773  		{
cec5aa7c Jason A. Donenfeld 2018-09-14  774  			u64 buf[15] = { 0 };
cec5aa7c Jason A. Donenfeld 2018-09-14  775  			u64 *nq = buf;
cec5aa7c Jason A. Donenfeld 2018-09-14  776  			u64 *x = nq;
cec5aa7c Jason A. Donenfeld 2018-09-14  777  			x[0] = 1;
cec5aa7c Jason A. Donenfeld 2018-09-14  778  			ladder_cmult(nq, scalar, q);
cec5aa7c Jason A. Donenfeld 2018-09-14  779  			format_scalar_of_point(mypublic, nq);
cec5aa7c Jason A. Donenfeld 2018-09-14  780  			memzero_explicit(buf, sizeof(buf));
cec5aa7c Jason A. Donenfeld 2018-09-14  781  		}
cec5aa7c Jason A. Donenfeld 2018-09-14  782  		memzero_explicit(e, sizeof(e));
cec5aa7c Jason A. Donenfeld 2018-09-14  783  	}
cec5aa7c Jason A. Donenfeld 2018-09-14  784  	memzero_explicit(buf0, sizeof(buf0));
cec5aa7c Jason A. Donenfeld 2018-09-14 @785  }

:::::: The code at line 785 was first introduced by commit
:::::: cec5aa7cd396d909f8555d2df80d3e1a0f94688b zinc: Curve25519 generic C implementations and selftest

:::::: TO: Jason A. Donenfeld <Jason@...c4.com>
:::::: CC: 0day robot <lkp@...el.com>

---
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