linux-kernel - [PATCH 3.18 52/68] infiniband: mlx5: avoid a compile-time warning

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Date:   Fri,  5 May 2017 11:32:37 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Eli Cohen <eli@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.18 52/68] infiniband: mlx5: avoid a compile-time warning

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

commit 7835bfb5261501590a508b3de3379e2231cb4853 upstream.

The return type of find_first_bit() is architecture specific,
on ARM it is 'unsigned int', while the asm-generic code used
on x86 and a lot of other architectures returns 'unsigned long'.

When building the mlx5 driver on ARM, we get a warning about
this:

infiniband/hw/mlx5/mem.c: In function 'mlx5_ib_cont_pages':
infiniband/hw/mlx5/mem.c:84:143: warning: comparison of distinct pointer types lacks a cast
     m = min(m, find_first_bit(&tmp, sizeof(tmp)));

This patch changes the driver to use min_t to make it behave
the same way on all architectures.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Eli Cohen <eli@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/hw/mlx5/mem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mlx5/mem.c
+++ b/drivers/infiniband/hw/mlx5/mem.c
@@ -69,7 +69,7 @@ void mlx5_ib_cont_pages(struct ib_umem *
 		for (k = 0; k < len; k++) {
 			if (!(i & mask)) {
 				tmp = (unsigned long)pfn;
-				m = min(m, find_first_bit(&tmp, sizeof(tmp)));
+				m = min_t(unsigned long, m, find_first_bit(&tmp, sizeof(tmp)));
 				skip = 1 << m;
 				mask = skip - 1;
 				base = pfn;