| Message ID | 1450787267-26836-3-git-send-email-andre.przywara@arm.com (mailing list archive) |
|---|---|
| State | RFC |
| Delegated to: | Herbert Xu |
| Headers | show |
On Tuesday 22 December 2015, Andre Przywara wrote: > The min3() macro expects all arguments to be of the same type (or > size at least). While two arguments are ints or u32s, one is size_t, > which does not match on 64-bit architectures. > Cast the size_t to u32 to make min3() happy. In this context here the > length should never exceed 32 bits anyway. > > Signed-off-by: Andre Przywara <andre.przywara@arm.com> Looks correct, but a bit ugly. Could we avoid the casts by using temporary variables to keep the size_t based data? Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Arnd, On 12/22/15 22:06, Arnd Bergmann wrote: > On Tuesday 22 December 2015, Andre Przywara wrote: >> The min3() macro expects all arguments to be of the same type (or >> size at least). While two arguments are ints or u32s, one is size_t, >> which does not match on 64-bit architectures. >> Cast the size_t to u32 to make min3() happy. In this context here the >> length should never exceed 32 bits anyway. >> >> Signed-off-by: Andre Przywara <andre.przywara@arm.com> > > Looks correct, but a bit ugly. Could we avoid the casts by using > temporary variables to keep the size_t based data? I guess this gets even uglier, but I found a better solution by promoting the other involved variables to size_t in this function. This works nicely for most of the cases, I just need two size_t casts now. Will send an updated version soon. Cheers, Andre. -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Dec 22, 2015 at 12:27:44PM +0000, Andre Przywara wrote: > The min3() macro expects all arguments to be of the same type (or > size at least). While two arguments are ints or u32s, one is size_t, > which does not match on 64-bit architectures. > Cast the size_t to u32 to make min3() happy. In this context here the > length should never exceed 32 bits anyway. > > Signed-off-by: Andre Przywara <andre.przywara@arm.com> > --- > drivers/crypto/sunxi-ss/sun4i-ss-cipher.c | 12 ++++++------ > drivers/crypto/sunxi-ss/sun4i-ss-hash.c | 8 ++++---- > 2 files changed, 10 insertions(+), 10 deletions(-) > > diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c > index a19ee12..b3bc7bd 100644 > --- a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c > +++ b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c > @@ -79,7 +79,7 @@ static int sun4i_ss_opti_poll(struct ablkcipher_request *areq) > oi = 0; > oo = 0; > do { > - todo = min3(rx_cnt, ileft, (mi.length - oi) / 4); > + todo = min3(rx_cnt, ileft, (u32)(mi.length - oi) / 4); For this case the min function has a min_t variant to specify the argument. What about introducing min3_t? BTW, I don't understand why min3(x, y, z) isn't just defined as #define min3(x, y, z) min(min(x, y), z) but instead as: #define min3(x, y, z) min((typeof(x))min(x, y), z) . I thought min(x, y) has the same type as x anyhow? Best regards Uwe
diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c index a19ee12..b3bc7bd 100644 --- a/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c +++ b/drivers/crypto/sunxi-ss/sun4i-ss-cipher.c @@ -79,7 +79,7 @@ static int sun4i_ss_opti_poll(struct ablkcipher_request *areq) oi = 0; oo = 0; do { - todo = min3(rx_cnt, ileft, (mi.length - oi) / 4); + todo = min3(rx_cnt, ileft, (u32)(mi.length - oi) / 4); if (todo > 0) { ileft -= todo; writesl(ss->base + SS_RXFIFO, mi.addr + oi, todo); @@ -94,7 +94,7 @@ static int sun4i_ss_opti_poll(struct ablkcipher_request *areq) rx_cnt = SS_RXFIFO_SPACES(spaces); tx_cnt = SS_TXFIFO_SPACES(spaces); - todo = min3(tx_cnt, oleft, (mo.length - oo) / 4); + todo = min3(tx_cnt, oleft, (u32)(mo.length - oo) / 4); if (todo > 0) { oleft -= todo; readsl(ss->base + SS_TXFIFO, mo.addr + oo, todo); @@ -216,7 +216,7 @@ static int sun4i_ss_cipher_poll(struct ablkcipher_request *areq) * todo is the number of consecutive 4byte word that we * can read from current SG */ - todo = min3(rx_cnt, ileft / 4, (mi.length - oi) / 4); + todo = min3(rx_cnt, ileft / 4, (u32)(mi.length - oi) / 4); if (todo > 0 && ob == 0) { writesl(ss->base + SS_RXFIFO, mi.addr + oi, todo); @@ -231,7 +231,7 @@ static int sun4i_ss_cipher_poll(struct ablkcipher_request *areq) * pass, so it is why we min() with rx_cnt */ todo = min3(rx_cnt * 4 - ob, ileft, - mi.length - oi); + (u32)mi.length - oi); memcpy(buf + ob, mi.addr + oi, todo); ileft -= todo; oi += todo; @@ -260,7 +260,7 @@ static int sun4i_ss_cipher_poll(struct ablkcipher_request *areq) if (tx_cnt == 0) continue; /* todo in 4bytes word */ - todo = min3(tx_cnt, oleft / 4, (mo.length - oo) / 4); + todo = min3(tx_cnt, oleft / 4, (u32)(mo.length - oo) / 4); if (todo > 0) { readsl(ss->base + SS_TXFIFO, mo.addr + oo, todo); oleft -= todo * 4; @@ -284,7 +284,7 @@ static int sun4i_ss_cipher_poll(struct ablkcipher_request *areq) * no more than remaining buffer * no need to test against oleft */ - todo = min(mo.length - oo, obl - obo); + todo = min((u32)mo.length - oo, obl - obo); memcpy(mo.addr + oo, bufo + obo, todo); oleft -= todo; obo += todo; diff --git a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c index ff80314..cd29009 100644 --- a/drivers/crypto/sunxi-ss/sun4i-ss-hash.c +++ b/drivers/crypto/sunxi-ss/sun4i-ss-hash.c @@ -245,7 +245,7 @@ int sun4i_hash_update(struct ahash_request *areq) */ while (op->len < 64 && i < end) { /* how many bytes we can read from current SG */ - in_r = min3(mi.length - in_i, end - i, + in_r = min3((u32)mi.length - in_i, end - i, 64 - op->len); memcpy(op->buf + op->len, mi.addr + in_i, in_r); op->len += in_r; @@ -266,8 +266,8 @@ int sun4i_hash_update(struct ahash_request *areq) } if (mi.length - in_i > 3 && i < end) { /* how many bytes we can read from current SG */ - in_r = min3(mi.length - in_i, areq->nbytes - i, - ((mi.length - in_i) / 4) * 4); + in_r = min3((u32)mi.length - in_i, areq->nbytes - i, + ((u32)(mi.length - in_i) / 4) * 4); /* how many bytes we can write in the device*/ todo = min3((u32)(end - i) / 4, rx_cnt, (u32)in_r / 4); writesl(ss->base + SS_RXFIFO, mi.addr + in_i, todo); @@ -289,7 +289,7 @@ int sun4i_hash_update(struct ahash_request *areq) if ((areq->nbytes - i) < 64) { while (i < areq->nbytes && in_i < mi.length && op->len < 64) { /* how many bytes we can read from current SG */ - in_r = min3(mi.length - in_i, areq->nbytes - i, + in_r = min3((u32)mi.length - in_i, areq->nbytes - i, 64 - op->len); memcpy(op->buf + op->len, mi.addr + in_i, in_r); op->len += in_r;
The min3() macro expects all arguments to be of the same type (or size at least). While two arguments are ints or u32s, one is size_t, which does not match on 64-bit architectures. Cast the size_t to u32 to make min3() happy. In this context here the length should never exceed 32 bits anyway. Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- drivers/crypto/sunxi-ss/sun4i-ss-cipher.c | 12 ++++++------ drivers/crypto/sunxi-ss/sun4i-ss-hash.c | 8 ++++---- 2 files changed, 10 insertions(+), 10 deletions(-)