RDMA/srp: Move large values to a new enum for gcc13

BugLink: https://bugs.launchpad.net/bugs/2008946

[ Upstream commit 56c5dab ]

Since gcc13, each member of an enum has the same type as the enum [1]. And
that is inherited from its members. Provided these two:
  SRP_TAG_NO_REQ        = ~0U,
  SRP_TAG_TSK_MGMT	= 1U << 31
all other members are unsigned ints.

Esp. with SRP_MAX_SGE and SRP_TSK_MGMT_SQ_SIZE and their use in min(),
this results in the following warnings:
  include/linux/minmax.h:20:35: error: comparison of distinct pointer types lacks a cast
  drivers/infiniband/ulp/srp/ib_srp.c:563:42: note: in expansion of macro 'min'

  include/linux/minmax.h:20:35: error: comparison of distinct pointer types lacks a cast
  drivers/infiniband/ulp/srp/ib_srp.c:2369:27: note: in expansion of macro 'min'

So move the large values away to a separate enum, so that they don't
affect other members.

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36113

Link: https://lore.kernel.org/r/20221212120411.13750-1-jirislaby@kernel.org
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

Author: Jiri Slaby (SUSE)

drivers/infiniband/ulp/srp/ib_srp.h

@@ -63,9 +63,6 @@ enum {
 	SRP_DEFAULT_CMD_SQ_SIZE = SRP_DEFAULT_QUEUE_SIZE - SRP_RSP_SQ_SIZE -
 				  SRP_TSK_MGMT_SQ_SIZE,
 
-	SRP_TAG_NO_REQ		= ~0U,
-	SRP_TAG_TSK_MGMT	= 1U << 31,
-
 	SRP_MAX_PAGES_PER_MR	= 512,
 
 	SRP_MAX_ADD_CDB_LEN	= 16,
@@ -80,6 +77,11 @@ enum {
 				  sizeof(struct srp_imm_buf),
 };
 
+enum {
+	SRP_TAG_NO_REQ		= ~0U,
+	SRP_TAG_TSK_MGMT	= BIT(31),
+};
+
 enum srp_target_state {
 	SRP_TARGET_SCANNING,
 	SRP_TARGET_LIVE,